mention "option IPFILTER"

1 files changed, 4 insertions, 0 deletions

diff --git a/share/ipf/nat.2 b/share/ipf/nat.2
index ee0002dc2cb..f3617374f68 100644
--- a/share/ipf/nat.2
+++ b/share/ipf/nat.2
@@ -3,6 +3,10 @@
 Don't forget to add "option GATEWAY" to the kernel config file or NAT will
 not work.  NAT requires IP packet forwarding.
 
+Don't forget to add "option IPFILTER" (and maybe "option IPFILTER_LOG"
+if you want ipmon(8) to work) to the kernel config file or NAT will
+not work.  NAT requires the IPF packet filter.
+
 You must have IPF enabled even if you aren't using it for anything or
 NAT will not work.  The standard way to do this is to make sure
 /etc/ipf.rules is installed and edit /etc/rc.conf changing